Branko lazich



June 30, 1931. I B, LAz c 1,812,208

RAILWAY TRACK CIRCUITS Filed June 4, 1930 mvENTo Bra /1K0 Lax/ch,

BY QR-W A ATTORNEY at nted Julie $193 l UNITED SYLVAN IA RAILWAY Timonorncnrrs ,Application medium 4 1930. Serial No. 459,131. 5

M invention relates'to railway track circuits, and has for anobject theprovision of means for reducing the time required for the release of a track relay armature when a 5 train enters the associated section. i

I will describe two forms oftrack circuit apparatus embodyingmy invention, and will then point out the novel featuresfthereof in claims, by

In the accompanying drawings,iFig. 1 is a diagrammatic view showing one form of trackcircuit apparatus embodying my inven tion. Fig. 2 is a-view showing a modification of the apparatus shown in Fig. 1. and also embodying my invention.

Similar referencecharacters refer to sim{ ilar parts in each of the views.-v I

Referring first to Fig.1, :the reference characters 1 and l designate the track rails of a railway, which rails are divided by insulatedfjoints 2 to provide a track section AB.

The reference character R designates a trackrelayhaving an armature 5 pivotally mounted at 5 and biased by gravity to its open position wherein a front contactlG-GY is open. The relay includes. a main winding 3 for closing the armature 5 'againstthe action of gravity, and an auxiliary winding 4 for.

creating in the armature a flux which opposes the flux created by the main winding '3. The main winding 3 is connected across the rails of section,A'-B, aresistance. 7 fpreferably being included in series with. this winding.

' .The auxiliary winding t is connected across the rails of section A B. in series with the usual source'of track circuit current,which, f

as here shown, isa battery C. I 1

h The windings 3*and45 are so proportioned v thatwhen the'tracksection'is unoccupied, the

flux created by winding "3 is considerably greater than the flux created by winding e,

andthat the resultant flux is suflicient to.

7 close the armature 5. When a train enters section AB, however, the wheels and axles will form a lowresistanceshuntacross the main windingfi and the resistance 7, so that a the mainwinding '3 will be-substantially deenergized, and the current flowing inv the I auxiliary winding 4 will be'materially. in-

not, provided. 7 I

, The-'partsofthe relay mustibe sopropore c.

.' tio'ned that when the .trackzsection AB is; occupied by a 'c'arl or train, 'the maximum I6-'T sultant flux is not suflicient to close the arma creased. The fluxidue-to the winding? BRANKO L zIoILor PITTSB RGH, PENNSYLVANI Assrsivonro )THE union swrroii & SIGNAL COMPANY, 013. SWISSVALE, PENNSYLVANIA, a. coR-ron 'rIoNfor' rENN- 7 which isindicatedby the solid ,arrowywillw will be reversed so that the fluxin the armature -will pass through zero.

This reversal' of the direction oftheflux through the arma; I I ture will cause the armature to release more 'i quickly than if the auxiliary winding 4Lwere turei5. I 1 Referring nowxto Fig.2, the-apparatus shown in this viewis thesame as that of Fig.5 1,1 except that meansareprovidedfor; cut zfl f ,tingthe auxiliary winding tiout ofthe track} i'.

circuit whenthe 1 relay, is open, so that this v windingwill not oppose tlie' main winding 3 when the relay-becomes energized. When, the. h,

relay is energized,winding4 is in the track circuit, the path being from rail 1? through I is opened and contact 78 isclosed, so that battery C. is connected directly across the rails and winding 4 is excluded from the track I circuit. 1

embodying my invention, because the breakage; ofanywire! or the failure'of th'esource of current C cannot cause the armature 5 tog. I

be falsely closed.

' Although. I have herein [shown and various changes and modifications may and scope of my invention battery 0, contact 7-6, and 'winding' 4m rail 1. When the relay is open, contact 76. 1 I

to, i I scribed only two forms of track circuits em J I vbodying my invention, it is understood that V ,I-Iaving thusidescribed my invention, what i Y I claim is 1. In combination, a section ofrailwayf I i ..-10g. track, a relay having a slngle magnetic c1re r cuit including an armature biased by gravity to the open position, said magnetic circuit being provided with a main Winding for closing said armature aswell as an auxiliary 5 Winding for creating in said magnetic circuit and in said armature a flux which opposes and is weaker than the flux created therein by said main winding, a connection across the rails of said section including said main winding and a second connection across the rails of said section including said auxiliary Winding and a source of current in series.

2. In combination, a section of railway track, a relay having two cooperating windings, a connection across the rails of said section including one of said windings, a second connection across the rails inluding the other of said windings and a source of current in series, and means for excluding said second Winding from said second con nection when the relay is open.

3. In combination, a section of railway track, a relay having an ari'nature biased by grayity to the open position and a main winding for closing said armature as well as an auxiliary winding for creating in said armature a. flux which opposes and is weaker than the flux created therein by said main winding, a connection across the rails of said section including said main winding, a second connection across the rails including said auxiliary winding and a source of current in series, and means for excluding said auxiliary winding from said second connection when the relay is open.

In testimony whereof I afiiX my signature.

BRANKO LAZIGH. 

